<html>
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Dear Roey and Jorn,<br>
<br>
Thank you very much for your suggestions.<br>
Roey, I have run ft_componentanalysis twice using the same version
of Matlab (was by chance running the script twice though). The
analyses yielded the almost identical results (still very slight
difference).<br>
J
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<![endif]-->örn, thank you very much for the tip. The same (almost
identical) results turn up after assigning the same random seed
number in the two different versions of Matlab.<br>
<br>
Cheers,<br>
Carmen<br>
<br>
<div class="moz-cite-prefix">On 16/07/2015 8:00 PM,
<a class="moz-txt-link-abbreviated" href="mailto:fieldtrip-request@science.ru.nl">fieldtrip-request@science.ru.nl</a> wrote:<br>
</div>
<blockquote
cite="mid:mailman.3.1437040801.16083.fieldtrip@science.ru.nl"
type="cite">
<pre wrap="">Send fieldtrip mailing list submissions to
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of fieldtrip digest..."
Today's Topics:
1. Two versions of matlab yield different output from runica
(Carmen Kung)
2. Re: Two versions of matlab yield different output from runica
(Roey Schurr)
3. Re: Two versions of matlab yield different output from runica
(=?utf-8?Q?J=C3=B6rn_M._Horschig?=)
----------------------------------------------------------------------
Message: 1
Date: Thu, 16 Jul 2015 18:05:48 +1000
From: Carmen Kung <a class="moz-txt-link-rfc2396E" href="mailto:carmen.kung@mq.edu.au"><carmen.kung@mq.edu.au></a>
To: <a class="moz-txt-link-abbreviated" href="mailto:fieldtrip@science.ru.nl">fieldtrip@science.ru.nl</a>
Subject: [FieldTrip] Two versions of matlab yield different output
from runica
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:55A765DC.1020207@mq.edu.au"><55A765DC.1020207@mq.edu.au></a>
Content-Type: text/plain; charset=utf-8; format=flowed
Dear fellow fieldtrippers,
A colleauge and I are analysing the same set of EEG data using the same
fieldtrip toolbox (the version of 20150522) but we have different
versions of matlab installed on each of our computer (mine is 2013b and
hers is 2014b). After running ft_componentanalysis (using runica), we
compared the output between us and we found that ft_componentanalysis
yielded mostly the same components but still there are differences in
ranking and the output.
Does anyone know why this is the case and suggest which Matlab version
we should use
Many thanks in advance,
Carmen
------------------------------
Message: 2
Date: Thu, 16 Jul 2015 11:15:26 +0300
From: Roey Schurr <a class="moz-txt-link-rfc2396E" href="mailto:roeysc@gmail.com"><roeysc@gmail.com></a>
To: FieldTrip discussion list <a class="moz-txt-link-rfc2396E" href="mailto:fieldtrip@science.ru.nl"><fieldtrip@science.ru.nl></a>
Subject: Re: [FieldTrip] Two versions of matlab yield different output
from runica
Message-ID:
<a class="moz-txt-link-rfc2396E" href="mailto:CAHm4wZByE1UuybV=+MsbVbCJDSJEm0s=ycAZGaUN9aZ6G51WrA@mail.gmail.com"><CAHm4wZByE1UuybV=+MsbVbCJDSJEm0s=ycAZGaUN9aZ6G51WrA@mail.gmail.com></a>
Content-Type: text/plain; charset="utf-8"
Dear Carmen,
have you tried running ft_componentanalysis twice on the same matlab? The
ICA algorithm has some intrinsic stochasticity in it, and therefore even
running it twice on one machine and one matlab version should yield similar
but not identical results.
I hope this is indeed the case, and that I'm not misleading you.
Best,
Roey
On Thu, Jul 16, 2015 at 11:05 AM, Carmen Kung <a class="moz-txt-link-rfc2396E" href="mailto:carmen.kung@mq.edu.au"><carmen.kung@mq.edu.au></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Dear fellow fieldtrippers,
A colleauge and I are analysing the same set of EEG data using the same
fieldtrip toolbox (the version of 20150522) but we have different versions
of matlab installed on each of our computer (mine is 2013b and hers is
2014b). After running ft_componentanalysis (using runica), we compared
the output between us and we found that ft_componentanalysis yielded mostly
the same components but still there are differences in ranking and the
output.
Does anyone know why this is the case and suggest which Matlab version we
should use
Many thanks in advance,
Carmen
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</pre>
</blockquote>
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Message: 3
Date: Thu, 16 Jul 2015 10:27:52 +0200
From: "=?utf-8?Q?J=C3=B6rn_M._Horschig?=" <a class="moz-txt-link-rfc2396E" href="mailto:jorn@artinis.com"><jorn@artinis.com></a>
To: "'FieldTrip discussion list'" <a class="moz-txt-link-rfc2396E" href="mailto:fieldtrip@science.ru.nl"><fieldtrip@science.ru.nl></a>
Subject: Re: [FieldTrip] Two versions of matlab yield different output
from runica
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:006f01d0bfa1$4f023910$ed06ab30$@artinis.com"><006f01d0bfa1$4f023910$ed06ab30$@artinis.com></a>
Content-Type: text/plain; charset="utf-8"
Dear Roey,
that is indeed true. ICA (at least most versions like runica) use some random initialization of the weights, which is realized by using a random number generator. You can set the random seed manually in FieldTrip/EEGLAB to verify whether you get the same results for different Matlab versions (as long as the algorithms for the random number generator has not changed). Not sure if results will be same across different operating systems though.
Best,
J?rn
PS: I vaguely remembered some bug in EEGLAB (which?s algorithm FieldTrip uses), so I looked it up on Bugzilla: <a class="moz-txt-link-freetext" href="http://bugzilla.fieldtriptoolbox.org/show_bug.cgi?id=2585">http://bugzilla.fieldtriptoolbox.org/show_bug.cgi?id=2585</a> so that one seems to be resolved.
--
J?rn M. Horschig, PhD, Software Engineer
<a class="moz-txt-link-rfc2396E" href="http://www.artinis.com/"><http://www.artinis.com/></a> Artinis Medical Systems | +31 481 350 980
From: <a class="moz-txt-link-abbreviated" href="mailto:fieldtrip-bounces@science.ru.nl">fieldtrip-bounces@science.ru.nl</a> [<a class="moz-txt-link-freetext" href="mailto:fieldtrip-bounces@science.ru.nl">mailto:fieldtrip-bounces@science.ru.nl</a>] On Behalf Of Roey Schurr
Sent: Thursday, July 16, 2015 10:15 AM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] Two versions of matlab yield different output from runica
Dear Carmen,
have you tried running ft_componentanalysis twice on the same matlab? The ICA algorithm has some intrinsic stochasticity in it, and therefore even running it twice on one machine and one matlab version should yield similar but not identical results.
I hope this is indeed the case, and that I'm not misleading you.
Best,
Roey
On Thu, Jul 16, 2015 at 11:05 AM, Carmen Kung <<a class="moz-txt-link-abbreviated" href="mailto:carmen.kung@mq.edu.au">carmen.kung@mq.edu.au</a> <a class="moz-txt-link-rfc2396E" href="mailto:carmen.kung@mq.edu.au"><mailto:carmen.kung@mq.edu.au></a> > wrote:
Dear fellow fieldtrippers,
A colleauge and I are analysing the same set of EEG data using the same fieldtrip toolbox (the version of 20150522) but we have different versions of matlab installed on each of our computer (mine is 2013b and hers is 2014b). After running ft_componentanalysis (using runica), we compared the output between us and we found that ft_componentanalysis yielded mostly the same components but still there are differences in ranking and the output.
Does anyone know why this is the case and suggest which Matlab version we should use
Many thanks in advance,
Carmen
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End of fieldtrip Digest, Vol 56, Issue 14
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